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Analog Devices Inc./Maxim Integrated MAX6746KA29/V+T
- Part No.:
- MAX6746KA29/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA29/V+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,665
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Product details
Overview
MAX6746KA29/V+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 2.925V ±2% VCC reset threshold, capacitor-adjustable 5.7–9.5ms reset timeout (CSRT = 1500pF), and selectable watchdog functionality - used in automotive engine control units to ensure deterministic μP restart during voltage brownouts.
For engineers reviewing the MAX6746KA29/V+T datasheet, MAX6746KA29/V+T pinout, MAX6746KA29/V+T application, or MAX6746KA29/V+T equivalent, this page delivers verified electrical specs, SOT23-8 pin mapping, AEC-Q100 automotive qualification status, and two validated alternative parts for dual-voltage monitoring or windowed watchdog upgrades.
Technical Context
The MAX6746KA29/V+T implements a precision bandgap-based reset comparator with 2.925V ±2% factory-trimmed threshold and 0.8% hysteresis, guaranteeing valid RESET output down to VCC ≥ 1.0V. It supports single-supply monitoring only (VCC), with no RESET IN input or dual-voltage capability.
It features a standard watchdog timer with normal/extended mode selection via WDS pin, enabling timeout periods from 0.51ms to 1214ms using CSWT (100pF–1500pF). The device lacks SET0/SET1 pins and does not support windowed watchdog operation - that function is exclusive to MAX6752/MAX6753 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V ±2% (factory-trimmed, TA = −40°C to +125°C) - ensures reliable power-on reset at nominal 3.3V rail without external resistor divider |
| Reset Timeout Period | 5.692–9.487ms (CSRT = 1500pF) - configurable via external capacitor to match μP reset hold-time requirements |
| Supply Current | 3.7µA typical (VCC ≤ 2.0V, TA = −40°C to +125°C) - enables battery-backed systems to operate >10 years on coin cell |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive applications per AEC-Q100 Grade 0 |
| Watchdog Timeout Range | 0.506–1214.4ms (CSWT = 100pF–1500pF, normal/extended mode) - supports both fast firmware polling and long idle intervals |
| RESET Output Type | Active-low push-pull - drives μP reset pin directly without external pull-up; VOL ≤ 0.3V @ ISINK = 50µA |
| Power Supply Range | VCC = 1.0V to 5.5V - operates through deep brownout while maintaining valid reset assertion |
Pinout & Package
MAX6746KA29/V+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 0.65mm pitch and 2.9mm × 1.6mm footprint - optimized for space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input; internally pulled up to VCC; asserts reset for full timeout period when held low ≥1µs |
| 2 | WDS (Watchdog Select) | Logic input selecting normal (GND) or extended (VCC) watchdog timeout - clears watchdog timer on state change |
| 3 | SWT (Watchdog Timeout) | Capacitor connection node; sets basic watchdog period tWD = 4.94×10⁶ × CSWT (seconds) |
| 4 | SRT (Reset Timeout) | Capacitor connection node; sets reset period tRP = 4.94×10⁶ × CSRT (seconds) |
| 5 | GND | Ground reference for all internal comparators and output drivers |
| 6 | WDI (Watchdog Input) | Falling-edge-triggered watchdog feed; must toggle within tWD to prevent reset assertion |
| 7 | RESET | Active-low push-pull output; guaranteed valid for VCC ≥ 1.0V; drives μP reset pin directly |
| 8 | VCC | Main supply input; monitored for reset; powers internal circuitry and bias networks |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.925V ±2% eliminates need for external resistor divider and calibration in production |
| Capacitor-adjustable timing | Independent SRT/SWT pins enable precise tuning of reset and watchdog delays without firmware changes |
| Power-supply transient immunity | Rejects 100mV transients lasting ≤50µs - prevents spurious resets during load dump or ignition noise |
| AEC-Q100 qualified | Grade 0 (−40°C to +125°C) qualification confirmed - suitable for engine control, transmission, and ADAS modules |
| Ultra-low quiescent current | 3.7µA max at VCC ≤ 2.0V enables >10-year shelf life in always-on vehicle subsystems |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply during cold cranking when battery dips to 6V, causing regulator output sag. IC Role / Device Role / Timing Role: Asserts RESET for 7.6ms upon VCC drop below 2.925V, ensuring clean μP restart before code execution resumes. Use Value: Prevents corrupted flash writes or sensor misreads during transient brownout - critical for ISO 26262 ASIL-B compliance. |
Use Scenario: Powers on image signal processor after vehicle ignition; must survive 100ms VCC dip during alternator engagement. IC Role / Device Role / Timing Role: Generates 7.6ms reset pulse and monitors WDI activity every 100ms to detect firmware lockup. Use Value: Guarantees camera reinitialization within 150ms of power recovery - meets OEM boot-time requirement for rear-view display. |
| Automotive Infotainment Head Unit | Telematics Control Unit (TCU) |
Use Scenario: Supervises dual-rail 1.2V core and 3.3V I/O supplies; detects undervoltage on 3.3V rail during USB peripheral hot-plug. IC Role / Device Role / Timing Role: Uses MR pin to synchronize reset with CAN bus wake-up signal, holding μP in reset until communication stack is ready. Use Value: Eliminates race condition between power sequencing and CAN initialization - reduces field-reported "no display" faults by 92%. |
Use Scenario: Maintains cellular modem operation during stop-start cycling; must retain valid reset state as VCC decays from 12V to 6V. IC Role / Device Role / Timing Role: Push-pull RESET remains asserted down to VCC = 1.0V, preventing partial boot of LTE baseband processor. Use Value: Enables seamless network reconnection post-cranking without SIM card re-authentication delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6748KA29/V+T | Includes adjustable RESET IN input (1.235V threshold); no MR pin; same VCC threshold and timing | Supports dual-voltage monitoring (e.g., VCC + 5V analog rail) but lacks manual reset | Select when monitoring external voltage rails is required and MR is unnecessary |
| MAX6752AKA32/V+T | Features windowed watchdog (tWD1/tWD2), fixed 3.200V VCC threshold, no MR pin, no WDS | Replaces standard watchdog with fault-detection logic for safety-critical firmware validation | Select when detecting both fast and slow processor hangs is mandatory per ISO 26262 ASIL-C |
Compared with MAX6746KA29/V+T, MAX6748KA29/V+T adds flexible external voltage monitoring at the cost of manual reset, while MAX6752AKA32/V+T replaces simple timeout supervision with windowed fault detection - neither is pin-compatible, but both share the same SOT23-8 footprint and automotive temperature rating.
Availability
MAX6746KA29/V+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, infotainment head units, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6746KA29/V+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices designs high-performance analog, mixed-signal, and digital signal processing components for precision sensing, power management, and real-time control applications.
The MAX6746–MAX6753 family delivers AEC-Q100-qualified μP supervisors with configurable reset/watchdog timing for automotive and industrial systems where deterministic startup and fault recovery are non-negotiable.
FAQ
What is the exact reset threshold voltage of MAX6746KA29/V+T and how is it trimmed?
The MAX6746KA29/V+T has a factory-trimmed VCC reset threshold of 2.925V ±2% over −40°C to +125°C, confirmed in the Electrical Characteristics table. This value corresponds to suffix "29" in Table 2 (MIN = 2.867V, TYP = 2.925V, MAX = 2.984V). Trim is performed at wafer test using laser or fuse-based calibration, eliminating need for external resistors. The MAX6746KA29/V+T does not support RESET IN monitoring - only VCC is supervised.
Does MAX6746KA29/V+T support dual-voltage monitoring like some other MAX67xx parts?
No. The MAX6746KA29/V+T monitors only the VCC supply and lacks the RESET IN pin required for external voltage monitoring. Dual-voltage capability is present only in MAX6748–MAX6751 variants (e.g., MAX6748KA29/V+T), which include pin 1 as RESET IN. The MAX6746KA29/V+T pinout shows pin 1 as MR, confirming single-supply supervision only.
Can MAX6746KA29/V+T be used in windowed watchdog applications?
No. Windowed watchdog functionality (min/max timing detection) is exclusive to MAX6752/MAX6753 variants, which feature SET0/SET1 pins and dual watchdog periods (tWD1 and tWD2). The MAX6746KA29/V+T contains only standard watchdog logic with WDS-selectable normal/extended modes - it cannot detect early or late WDI transitions, only missed ones.
What is the minimum VCC voltage at which MAX6746KA29/V+T guarantees valid RESET output?
The MAX6746KA29/V+T guarantees correct RESET logic state for VCC ≥ 1.0V, as stated in the Absolute Maximum Ratings and Detailed Description sections. Below 1.0V, RESET may float or become indeterminate. For applications requiring valid reset down to 0V, a 100kΩ pulldown resistor on the push-pull RESET output is recommended - a solution explicitly documented for MAX6746 variants in the datasheet's "Ensuring a Valid RESET Down to VCC = 0V" section.
Is MAX6746KA29/V+T AEC-Q100 qualified and what grade does it meet?
Yes. The MAX6746KA29/V+T is AEC-Q100 qualified per Grade 0 (−40°C to +125°C ambient), as confirmed in the "Benefits and Features" section and Ordering Information. This qualification covers stress testing for temperature cycling, humidity, ESD, and vibration - making it suitable for under-hood automotive applications including engine control, transmission, and body electronics where reliability is mission-critical.
MAX6746KA29/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6746KA29/V+T FAQ
1.How can I place an order for MAX6746KA29/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA29/V+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6746KA29/V+T reliable?
The price and inventory of MAX6746KA29/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA29/V+T is usually 5 days.
3.What payment methods are accepted for MAX6746KA29/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA29/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA29/V+T?
MAX6746KA29/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA29/V+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6746KA29/V+T?
For technical support, including MAX6746KA29/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA29/V+T requirements.
6.How does Aetrix verify that MAX6746KA29/V+T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA29/V+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6746KA29/V+T meets industry standards.
7.What is the process for return or replacement of MAX6746KA29/V+T?
All MAX6746KA29/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA29/V+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6746KA29/V+T part is unused and in its original packaging.
Return procedure for MAX6746KA29/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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